I'm at work but I have a rig on win7 32 bit with 5 5850's. It gets around 1950 megahash.

That sounds right on the money, thank you for confirming. Guy with 3x6990's numbers had me questioning this. Now time to order up some risers got 7 pcie's waiting to be tapped

Just a heads up. Some motherboards have 6+ pcie slots but don't allow you to use them all. What board do you have? Also I'm pretty sure the limit is 8 gpu's not 8 physical graphics cards so you couldn't run 7 6990's on one mobo as they have dual gpu's.

I'm at work but I have a rig on win7 32 bit with 5 5850's. It gets around 1950 megahash.

That sounds right on the money, thank you for confirming. Guy with 3x6990's numbers had me questioning this. Now time to order up some risers got 7 pcie's waiting to be tapped

Just a heads up. Some motherboards have 6+ pcie slots but don't allow you to use them all. What board do you have? Also I'm pretty sure the limit is 8 gpu's not 8 physical graphics cards so you couldn't run 7 6990's on one mobo as they have dual gpu's.

I also have 3 X 6990's with clocks set at 900/840(OC switch in default position) I get between 400mh/s - 405mh/s per GPU which is around 2400 mh/s, I would turn the OC switch on and crank the core up but I have cooling problems so I stick with 900/840 settings...